Most people probably remember JTT — as he was called in the teen fan magazines — as a young teenager on the hit ABC series.

When JTT started the show, he was just a baby-faced 10-year-old:

"Home Improvement"

By the time the show ended in 1998, JTT was 17-years-old and the object of every young girl's desire:

Got Milk?

Now age 31— after earning degrees from both Harvard and Columbia — JTT is returning to the limelight as a guest star on his former TV dad Tim Allen's ABC show "Last Man Standing" playing a successful restaurateur: